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Undue Economy in SOME operators are proud of Buying Plugs is " the extreme longevity of
Wasteful many of the sParking plugs in
the engines of their vehicles. This " economy " may not always, however, be a true one—in fact, it may be wasteful. A good set of plugs plays a large part in the liveliness of a power unit, and whilst those of good make can be cleaned and adjusted many times, the points eventually become so burnt that further attention in this way is little more than useless. One trouble which may develop is auto-ignition, when an engine continues firing for a few revolutions after the switch has been• brought to the " off " position. This is because some parts, probably• the points, have become overheated and almost incandescent. This, again, leads to preignition and overheating which wastepower. Similar
Al4 faults can be caused by using the wrong type of plug for the engine, and a return should at once be made to that officially recommended; but if merely due to old age, new plugs should be fitted.
American Synthetic IN 1944 the .U.S.A. produced Rubber Programme is 737,000 tons of synthetic Attained rubber, which is more than the pre-war consumption; also, production capacity is now 1,000,000 tons per annum, which is over 80 per cent of the Far Eastern prewar output. Where the raw material was alcohol from grain, the price was 33 cents per pound, but where petroleum was the source, the price was 18 cents per pound, which was that of pre-war natural rubber. in America. American Operators 13110AD .carriers of goods in Pro" America have received a
shock concerning the supply of
new vehicles during 1945. Over-optimistic views upon the war position, had led to an original promise of almost double the 1944 output of goods motor vehicles of all kinds for civilian use, but this has been cut by over 21 per cent. For the first half, of this year, the original programme of 133,410 vehicles of all sizes, of which about 10 per cent, were set aside for export, leaving about 1204000 for domestic purposes, was to be followed by double this output for the remainder of the year, representing a total of 360,000. The revised home allocation for the full year will be 188,883. However, this compares favourably with the expected final figure for 1944, which is just over 103,000. It is, of course, quite possible that if military output be cut for the •
Second half, the civilian programme would be much increased. This would,' however, introduce difficulties because of the need for maintaining an adequate flow of materials. .
A Chromium-plating LECTRO-DEPOSITION of
Technique for Cutting ."--ohard chromium on to small
Tools . . . . tools is an advancing tech nique. Those subjected to impact should not receive thick deposits, a maximum of 0.005 in. being the suggested coat. On punches a hardness factor of between 600 and 820 Brinell for the chromium is beneficient. Drills are being treated in rapidly increasing numbers, and for bet results a reasonably high finish on the flutes should be provided before the treatment. A deposit of 0.00020.0005 in. is usual to reduce the friction of the chips passing up the flutes.